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Before the fruit begins to ripen, it is essential to classify and differentiate the grapes based on their variety characteristics and the growth of the vines and leaves. For instance, the "Jiufeng" grape variety tends to shed flowers and fruits easily. Therefore, during foliar fertilization, nitrogen levels should be carefully controlled, with a greater emphasis on phosphorus, potassium, and boron to support healthy development.
In addition, considering the specific nutrient needs during the berry expansion stage, it's important to not only provide boron but also include other essential micronutrients such as magnesium, calcium, iron, and manganese. These elements play a crucial role in enhancing fruit quality and overall plant health.
Long-term experimental results have shown that applying potassium-based root fertilizers during the coloring period of grapes can significantly improve fruit color and increase sugar content. It is recommended to apply 3 to 4 rounds of foliar fertilizer before fruiting. In the first two applications, a mixture containing phosphorus, potassium, a small amount of nitrogen, along with boron, magnesium, and iron is ideal. After that, the focus should shift toward increasing potassium and calcium levels—such as using a 0.1% to 0.5% potassium dihydrogen phosphate solution.
In the month leading up to harvest, spraying the grapes with a 0.1% to 0.5% calcium nitrate or calcium chelate solution twice can greatly enhance their storage and transportation qualities, ensuring better marketability.
This approach not only improves yield and fruit quality but also helps in maintaining the long-term health of the vineyard. By tailoring fertilization strategies to the specific needs of each grape variety and growth stage, growers can achieve more consistent and high-quality results.
Agricultural Science and Technology Newspaper
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